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Other Comprehensive Income (Loss) - Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Amortization of net (gain) loss | $ 1,219 |  |  | $ 934 |  |  | $ 701 | $ (3,565)
Reclassification adjustments | 11,330 |  |  | 10,958 |  |  | 33,262 | 33,098
Income before income taxes | (129,216) |  |  | (133,241) |  |  | (410,867) | (400,114)
Provision for income taxes | 24,022 |  |  | 26,889 |  |  | 82,196 | 87,678
Net income | (105,194) | $ (113,209) | $ (110,268) | (106,352) | $ (107,126) | $ (98,958) | (328,671) | (312,436)
Reclassification out of Accumulated Other Comprehensive Income | Net Prior Service Attributable to Parent |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Amortization of net (gain) loss | 2,188 |  |  | 1,725 |  |  | 5,579 | 5,396
Reclassification out of Accumulated Other Comprehensive Income | Retirement Benefits Adjustment |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Income before income taxes | 2,188 |  |  | 1,725 |  |  | 5,579 | 5,396
Provision for income taxes | (525) |  |  | (455) |  |  | (1,398) | (1,417)
Net income | 1,663 |  |  | 1,270 |  |  | 4,181 | 3,979
Reclassification out of Accumulated Other Comprehensive Income | Cumulative Unrealized Gain (Loss) on Derivatives |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Reclassification adjustments | 1,566 |  |  | 1,610 |  |  | 4,737 | 4,869
Income before income taxes | 1,566 |  |  | 1,610 |  |  | 4,737 | 4,869
Provision for income taxes | (356) |  |  | (366) |  |  | (1,076) | (1,105)
Net income | $ 1,210 |  |  | $ 1,244 |  |  | $ 3,661 | $ 3,764

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